John walkbe



(No Model.)

J. WALKER.

Shaft Coupling.

No. 230,843. Patented Aug. 3,1880.

WITNEIEEEET I'NVENTQFQr NITED STATES PATENT OFFICE.

JOHN WALKER, OF INDIANAPOLIS, INDIANA.

SHAFT-COUPLING.

SPECIFICATION forming part of Letters Patent No. 230,843, dated August 3, 1880.

(No model.)

To all whom it may concern:

Be it. known that I, JOHN WALKER, of Indianapolis, in the county of Marion and State of Indiana, have invented certain Improvements in Shaft-Couplings, of which the following is a specification; and I do hereby declare that in the same is contained a full, clear, and exact description of my said invention, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon.

This im'ention relates to certain improvements in the shaft-coupling for which Letters Patent bo.221,128 were granted to me on the 28th day of October, 1879.

The coupling described in the said Letters Patent, briefly stated, consists of an outer continuous cylindrical shell, to the inner surface of which are attached two independently-operating open-ring clamps, each one of which has a fixed and a free end. The clamps are drawn tightly around the ends of the shaft by means of bolts which pass loosely through the outer shell and the fixed ends of the clamps, and are screwed into the free ends thereof.

The object of my present invention is, in part, to simplify and cheapen the construction of the coupling by dispensing with the narrow segmental cores which are used in molding the coupling to form the space between the shell and the spring-ring clamps, and, further, to avoid the indirect strain to which the coupling-bolts are subjected in the clamp operation.

\Vith this view I cast the parts of the coupling into which the bolts are screwed separate from the remaining portion of the device, thereby giving such open space in the interior of the coupling as will admit of the coupling being made in green sand that is to say, it can be molded in such manner as to leave its own core, thus dispensing with the driedsand segmental core before alluded to. Further, I place beneath the nuts or heads of the coupling-bolts washers having a spherical under surface, which fit in correspondinglyshaped recesses. By this means the washers adapt themselves to any change in position of the bolts, bolt-heads, or nuts as the same are turned, and compensate forirregularities in the nuts or heads.

In the further description of my said invention which follows reference is made to the accompanying drawings, forming a part hereof, and in which- Figure I is a partly-sectional longitudinal view of the improved coupling. Fig. II is a longitudinal view of the same. as seen from a different point. Figs. III and IV are transverse sections of the invention. Fig. V is an end view of a part of the coupling. Fig. VI illustrates a modification in the shape of the coupling.

Similar letters of reference indicate similar parts in all the views.

A is the shell of the coupling, from the inner surface of which project the fixed membcrs B of the clamps. The removable members of the clamps are represented by O.

The clamps are drawn tightly in contact with the shafts, which are denoted by D and E, by means of the bolts F, which pass loosely through the shell and the fixed members of the clamps, and are screwed into the removable members O.

G G are what I term ball-washcrsthat is to say, washers having a spherical under surface, which admits of the washers adjusting themselves to their proper position as the bolts are tightened. The application of these washers to the bolts renders it unnecessary to dress out the lower surface of the recesses for the bolt-heads to make them at a right angle with I the bolts. The bolt-heads or nuts are covered JOHN WALKER. 

